HVDC Power Transmission MCQ

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HVDC or High voltage Direct Current use direct current for bulk transmission of electric power. Unlike AC (which uses three conductors) it uses two conductors (thus requires less material).

HVDC MCQ Questions

Pros of HVDC Power

Which of the following are pros of HVDC over AC:

  1. Absence of Capacitance
  2. Absence of inductance
  3. Absence of phase displacement
  4. All of these

Correct answer: 4. All of these

VSC Converters for HVDC Power Transmission use

VSC Converters use:

  1. Thyristors
  2. Power diode
  3. Transistors
  4. All of these

Correct answer: 3. Transistors

VSC or Voltage-source converters for HVDC employ Insulated-gate bipolar transistor (IGBT) transistors.

Generally the Converter transformers used in VSC HVDC systems are ____ as compare to LCC HVDC systems

Generally the Converter transformers used in VSC HVDC systems are _________ as compare to LCC HVDC systems:

  1. Complex
  2. Simple
  3. Identical

Correct answer: 2. Simple

Symmetrical monopole converters are earthed with impedance

Symmetrical monopole converters are earthed with impedance:

  1. Zero
  2. Low
  3. Medium
  4. High

Correct answer: 2. Low

Corona in HVDC – MCQ Question

“Statement: Corona is violet glow, hissing noise and ozone formation phenomenon.
Assertion: DC lines have no corona”

  1. Statment is correct, assertion is wrong
  2. Statement is wrong, assertion is correct
  3. Both are correct
  4. Both are wrong

Correct answer: 1. Statment is correct, assertion is wrong

High Voltage dc transmission requires filters for

High voltage dc transmission requires filters for:

  1. Line commuted converters
  2. Voltage sourced converters
  3. Both of these
  4. None of these

Correct answer: 3. Both of these

With the recent advancements in Modular Multilevel Converter (MMC) the levels of harmonic distortion are almost negligible. However, in the case of line-commutated converters and other simpler types of voltage-source converters reasonable distortions are sometimes evident on both the AC and DC sides of the converter. Due to this, the harmonic filters are required at the AC terminals of such converters.

Good to know: In HVDC transmission schemes that are employing overhead lines sometimes also required filters on the DC side.

Back to Back hvdc is used to

Back to Back HVDC is used to:

  1. Interconnect two asynchronous AC systems
  2. Stabilization of AC systems
  3. For reducing short circuit currents
  4. All of these

Correct answer: 4. All of these

Back to back HVDC is used to interconnect two asynchronous AC system. Alongside this it finds its applications on frequency controls of AC systems, and reduction of short circuits currents.

VSC posses which property

VSC has:

  1. Fixed DC voltage polarity
  2. Fixed DC current polarity
  3. Both of these
  4. None of these

Correct answer: 1. Fixed DC voltage polarity

VSC posses DC voltage polarity

LCC posses which property

LCC has:

  1. Fixed DC voltage polarity
  2. Fixed DC current polarity
  3. Both of these
  4. None of these

Correct answer: 1. Fixed DC current polarity

LCC posses fixed DC current polarity

As compared to AC, a DC Line carries

As compared to AC, a DC Line carries:

  1. More power
  2. Less power
  3. Same power

Correct answer: 1. More power

A DC line carries more power as compared to an AC line.

More MCQ on HVDC

  1. Which one is the most popular device used for HVDC
  2. Application of SCR Anode Cathode and Gate in HVDC Applications
  3. A 24-pulse converter unit consists of how many six-pulse bridges

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